<template>

  <div class="app-container">

    <h2 style="text-align: center;">发布新课程</h2>

    <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="填写课程基本信息"/>
      <el-step title="创建课程大纲"/>
      <el-step title="提交审核"/>
    </el-steps>

    <el-form label-width="120px">
      <el-button type="text" @click = "openDialog">添加章节</el-button>
      <!-- 添加章节 -->
      <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
        <el-form :model="chapter" label-width="120px">
          <el-form-item label="章节标题">
            <el-input v-model="chapter.title"/>
          </el-form-item>
          <el-form-item label="章节排序">
            <el-input-number v-model="chapter.sort" :min="0" controls-position="right"/>
          </el-form-item>
        </el-form>
        <div slot="footer" class="dialog-footer">
          <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
          <el-button :disabled="saveChapterBtnDisabled" type="primary" @click="saveOrUpdate">确 定</el-button>
        </div>
      </el-dialog>
      <!-- 小节弹窗 -->
      <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
        <el-form :model="video" label-width="120px">
          <el-form-item label="课时标题">
            <el-input v-model="video.title"/>
          </el-form-item>
          <el-form-item label="课时排序">
            <el-input-number v-model="video.sort" :min="0" controls-position="right"/>
          </el-form-item>
          <el-form-item label="是否免费">
            <el-radio-group v-model="video.isFree">
              <el-radio :label="true">免费</el-radio>
              <el-radio :label="false">收费</el-radio>
            </el-radio-group>
          </el-form-item>
          <el-form-item label="上传视频">
            <el-upload
              :on-success="handleVodUploadSuccess"
              :on-remove="handleVodRemove"
              :before-remove="beforeVodRemove"
              :on-exceed="handleUploadExceed"
              :file-list="fileList"
              :action="BASE_API+'/vodService/video/uploadVideo'"
              :limit="1"
              class="upload-demo">
              <el-button size="small" type="primary">上传视频</el-button>
              <el-tooltip placement="right-end">
                <div slot="content">最大支持1G，<br>
                  支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
                  GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
                  MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
                  SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
                <i class="el-icon-question"/>
              </el-tooltip>
            </el-upload>
          </el-form-item>
        </el-form>
        <div slot="footer" class="dialog-footer">
          <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
          <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
        </div>
      </el-dialog>
      <ul class="chanpterList">
        <li
          v-for="chapter in chapterVideoTree"
          :key="chapter.id">
          <p>
            {{ chapter.title }}

            <span class="acts">
              <el-button type="text" @click="openVideoDialog(chapter.id)">添加课时</el-button>
              <el-button style="" type="text" @click.native="editChapter(chapter.id)">编辑</el-button>
              <el-button type="text" @click="deleteChapter(chapter.id)">删除</el-button>
            </span>
          </p>

          <!-- 小节 -->
          <ul class="chanpterList videoList">
            <li
              v-for="video in chapter.children"
              :key="video.videoSourceId">
              <p>{{ video.title }}
                <span class="acts">
                  <el-button type="text" @click="editVideo(video.id)">编辑</el-button>
                  <el-button type="text" @click="deleteVideo(video.id)">删除</el-button>
                </span>
              </p>
            </li>
          </ul>
        </li>
      </ul>
      <el-form-item>
        <el-button @click="previous">上一步</el-button>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
      </el-form-item>
    </el-form>
  </div>
</template>
<script>
import chapterApi from '@/api/edu/chapter'
import videoApi from '@/api/edu/video'
export default {
  data() {
    return {
      saveBtnDisabled: false, // 保存按钮是否禁用
      chapterVideoTree: [],
      courseId: '',
      dialogChapterFormVisible: false,
      chapter: {
        title: '',
        sort: '',
        courseId: ''
      },
      saveChapterBtnDisabled: false,
      video: {
        title: '',
        sort: '',
        isFree: true,
        videoSourceId: '',
        videoOriginalName: ''
      },
      dialogVideoFormVisible: false,
      saveVideoBtnDisabled: false,
      fileList: [], // 上传文件列表
      BASE_API: process.env.BASE_API // 接口API地址
    }
  },

  created() {
    this.courseId = this.$route.params.id
    this.getChapterTree(this.courseId)
  },

  methods: {
    // 成功回调
    handleVodUploadSuccess(response, file, fileList) {
      this.video.videoSourceId = response.data.videoId
      this.video.videoOriginalName = file.name
    },
    // 视图上传多于一个视频
    handleUploadExceed(files, fileList) {
      this.$message.warning('想要重新上传视频，请先删除已上传的视频')
    },
    handleVodRemove() {
      videoApi.deleteVideo(this.video.videoSourceId).then(res => {
        this.$message({
          type: 'success',
          message: '删除成功!'
        })
        this.video.videoSourceId = ''
        this.video.videoOriginalName = ''
      })
    },

    beforeVodRemove(file, fileList) {
      return this.$confirm(`确定删除${file.name}`)
    },
    // 删除小节
    deleteVideo(videoId) {
      this.$confirm('此操作将删除所选小节, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        videoApi.deleteVideoById(videoId).then(res => {
          this.$message({
            type: 'success',
            message: '删除成功!'
          })
          this.getChapterTree(this.courseId)
        })
      })
    },

    // 修改小节弹窗
    editVideo(videoId) {
      this.dialogVideoFormVisible = true
      // 信息回显
      videoApi.getVideoById(videoId).then(res => {
        this.video = res.data.video
      })
    },

    // 添加小节弹窗
    openVideoDialog(chapterId) {
      this.dialogVideoFormVisible = true
      this.video = {}
      this.fileList = []
      this.video.chapterId = chapterId
      this.video.courseId = this.courseId
    },
    addVideo() {
      videoApi.addVideo(this.video).then(res => {
        this.$message({
          type: 'success',
          message: '添加成功!'
        })
        this.dialogVideoFormVisible = false
        this.getChapterTree(this.courseId)
      })
    },

    updateVideo() {
      videoApi.updateVideo(this.video).then(res => {
        this.$message({
          type: 'success',
          message: '修改成功!'
        })
        this.dialogVideoFormVisible = false
        this.getChapterTree(this.courseId)
      })
    },

    saveOrUpdateVideo() {
      if (this.video.id) {
        console.log('111111')
        this.updateVideo()
      } else {
        this.addVideo()
      }
    },

    // =======================
    deleteChapter(chapterId) {
      this.$confirm('此操作将删除所选章节, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        chapterApi.deleteChapterById(chapterId).then(res => {
          this.$message({
            type: 'success',
            message: '删除成功!'
          })
          this.getChapterTree(this.courseId)
        })
      })
    },
    editChapter(chapterId) {
      this.dialogChapterFormVisible = true
      this.getChapterById(chapterId)
    },

    getChapterById(chapterId) {
      chapterApi.getChapterById(chapterId).then(res => {
        this.chapter = res.data.chapter
      })
    },

    openDialog() {
      this.dialogChapterFormVisible = true
      this.chapter = {}
    },
    saveOrUpdate() {
      this.chapter.courseId = this.courseId
      if (this.chapter.id) {
        this.updateChapter()
      } else {
        this.addChapter(this.courseId)
      }
    },

    addChapter(courseId) {
      chapterApi.addChapter(this.chapter).then(res => {
        this.dialogChapterFormVisible = false
        this.$message({
          type: 'success',
          message: '添加成功!'
        })

        this.getChapterTree(courseId)
      })
    },

    updateChapter() {
      chapterApi.updateChapter(this.chapter).then(res => {
        this.dialogChapterFormVisible = false
        this.$message({
          type: 'success',
          message: '保存成功!'
        })
      })

      this.getChapterTree(this.chapter.courseId)
    },

    previous() {
      this.$router.push({ path: '/course/info/' + this.courseId })
    },

    next() {
      this.$router.push({ path: '/course/publish/' + this.courseId })
    },

    getChapterTree(id) {
      chapterApi.getChapterTree(id).then(res => {
        this.chapterVideoTree = res.data.chapterVideoTree
      })
    }
  }
}
</script>
<style scoped>
.chanpterList{
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
}
.chanpterList li{
  position: relative;
}
.chanpterList p{
  /* float: left; */
  font-size: 20px;
  margin: 10px 0;
  padding: 10px;
  height: 70px;
  line-height: 50px;
  width: 100%;
  border: 1px solid #DDD;
}
.chanpterList .acts {
    float: right;
    font-size: 14px;
}

.videoList{
  padding-left: 50px;
}
.videoList p{
  /* float: left; */
  font-size: 14px;
  margin: 10px 0;
  padding: 10px;
  height: 50px;
  line-height: 30px;
  width: 100%;
  border: 1px dotted #DDD;
}

</style>
